wilkinson



2 Sheets-Sheet 1.

(No Model) J. WILKINSON. LET-OFF MOTION FOR LOOMS.

No. 416,025. Patented Nov. 26, 1889.

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.2 SheetsSheet (No Model.)

J. WILKINSON. LET-OFF MOTION FOR LOOMS. 110.416.025. a Patented Nov. 26,1889.

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UNITED STATES PATENT OFFICE.

J ABEZ .IVILKINSON, OF FALL RIVER, MASSACHUSETTS.

LET-OFF MOTION FOR LOOMS.

SPECIFICATION formingpart of Letters Patent No. 416,025, dated November26, 1889.

Application filed August 13, 1888. Serial No. 282,502. (No model.)

To aZZ whom it may concern:

Be it known that I, JABEZ WILKINSON, of Fall River, in the countyof'Bristol and State of Massachusetts, have invented certain new anduseful Improvements in Let-Off Motions for Looms, of which the followingis a specification.

My invention relates to let-01f motions for looms, and has for itsobject, first, the provision of improvements whereby the requisitequantity of warps for each shoot or pick may be delivered from theyarn-beam V at the time such pick is made; second, the provision ofimprovements whereby an even tension may be preserved on the warp from afull beam to the last round of warp thereon.

In bob-wire let-off motions, or such as employ a pallet and toothedwheel, the motion, when operated at all, is moved to the extent of onetooth of the wheel, and each of these movements effects the deliveryfrom the yarn-beam of warp enough or from four to eight or more picks,resulting in the variation of the tension on the warp and a consequentvariation of the texture of the cloth being woven. Again, as is wellknown, the tension on the warp varies as the amount of warp on the yarnbeam varies, since with a full beam the warp being drawn off exerts agreater leverage, as it were, in turning the beam than when the latteris nearly empty. By my improvements, hereinafter fully described andclaimed, these obj ections and difficulties are entirely overcome.

Reference is to be had to the accompanying drawings, and to the lettersof reference marked thereon, forming a part of this specification, ofwhich drawings- Figure 1 represents a rear view of a loom, or a portionof a loom, equipped with my invention. Fig. 2 is an end view of thesame. Fig. 3 is a vertical sectional view taken on the line 00 of Fig,1, looking in the direction of the arrow. Fig. 4 is a vertical sectionalview taken on the line y y, Fig. 2. Figs.

-5 and 6 are detail views, hereinafter referred provided on its innerend with a pinion g,

engaging with a gear-wheel h, secured on the shaft of yarn-beam b, sothat by the rotation of the yarn-beam the pulley (Z will also berotated.

i designates a strap, one end of which is secured at j to a rotary hub kon a stud Z of a bracket m, adj ustably secured, as shown, to

one end of a rock-rod If, as hereinafter explained. From the point j thestrap t' passes around the periphery of pulley (Z and around a curvedspring a, secured to the hub k, and is at its opposite end secured at 0to said hub.-

designates a lever attached at its inner end to the hub is and at itsouter endpassing through a loop or slot formed in a strip se cured tothe weight g on the lower end of a wire or rod 1', attached at its upperend to the outer end of vibrator-arm s.

\Vith this construction and arrangement of devices, when the lay (notshown) is back from the fell of the cloth 'or cloth-making point, thewarp 10 will be sufficiently slack to permit the vibrator o to assumeits normal position, and with the latter device in this position theouter end of arm .9, carrying Weight g, through the medium of rod orwire 7', will be allowed to fall, carrying with it the outer or free endof lever p, and so turning hub 7a, to which spring a is attached, as totighten the band or strap 0' around the periphery of pulley cl andfrictionally hold said pulley, and consequently the yarn-beam b, fromturning. lVhen, however, the lay moves forward to beat up a pick orshoot of weft, the warp will be drawn quite taut over vibrator c,causing the latter to rock forward and to momentarily raise the outerend of arm 5, and, through the medium of its attached devices, operatingin the direction the reverse of that just described, loosenfriction-strap 11 on pulley (Z sufficiently to permit the latter tobeam.

respond to the stress brought upon the yarnbeam by the warp and turn toan extent that will allow of the delivery or letting off of warp fromthe yarn-beam sufficient to compensate for the amount taken up by theshoot of weft put in. v

The degree of frictional resistance to the rotation of pulley d impartedby strap or band t can readily be regulated by the adj ustment ofbracket m, to which the hub 7c is attached. The adj usting mechanism isshown in detail in Figs. 5 and 6. An arm having a longitudinal slot 25,extends at right angles from the rod 2, and an adj Listing-screw Z inthe bracket m passes through and engages with the slot t.

As has already been explain ed, the warp is drawn offthe yarn-beam muchmore easily when the beam is full than when it is nearly empty, and toregulate or render even what would otherwise be an unequal tensionresulting from this cause I arrange a rock-rod t in suitable bearingsattached to the loom-frame below the yarn-beam, as shown, and secure thelower end of an arm to to said rod, providing the upper end with aroller 1 or it may be a pad adapted to rest on the warp on the yarn-(See Figs. 1, 3, and 4.) A spiral spring .2, surrounding rock-rod t andconnected therewith and with the frame of the loom, serves to rock saidrod, so as to keep roller 4; in contact with the warp on the warpbeam.As shown in Figs. 5 and 6, the stud Z,

on which is arranged the hub 70, is eccentrically connected withrock-rod 25 through the medium of bracket m, so that as the upper end ofarm a is moved outward from the axis of the yarn-beam, as it will bewhen the yarn-beam is full, hub will be moved away from the axis ofpulley (1, so as to tighten the strap about said pulley, and as theupperend of arm 14 moves inward toward the axis of the yarn-beam hub Itwill be moved toward the axis of pulley d, and so slacken thefrictionstrap passing therearound, thus compensating for the increase indraft necessary to unwind the warps from the yarn-beam when the latteris nearly empty.

Having thus described my inven tion,what I claim is 1. The combination,with the vibrator and its arm, of a friction-pulley and itsjournalshaft, a pinion 011 said shaft, the yarn-beam, a gear 011 theyarn-beam engaging with said pinion, a strap surrounding the pulley toretard .its rotation, a hub j ournaled below said pulley and with whichsaid strap is connected, the spring n, lever p, a connection from thevibrator-arm to said lever, and a weight attached to said connection, asset forth.

2. The combination, with the loom-frame and pulley d, of a bracketprovided with a stud, a hub journaled on said stud and provided with aspringn, afriction-strap passing around said pulley and spring andhaving an end secured to said hub, and a lever 1), secured at one end tosaid hub, the vibrator, a connection from the vibrator to said lever 17,and a weight, as set forth.

3. The combination, with the loom-frame, the vibrator, and its arm, ofthe pulley d, its shaft, a pinion on said shaft adapted to be engaged bythe gear on ayarn-beam, a bracket provided with a stud, a hub j ournaledon said stud and provided with a spring, a frictionstrap passing aboutsaid pulley and having its ends secured to said hub, a lever 19, securedat one end to said hub, a Weight connected with the other end of saidlever, and a rod or wire connecting said weight with the vibratorarm, asset forth.

4. The combination, with the loom-frame, of the rock-rod 25, arrangedbelow the beam and having an eccentrically-mounted hub at its outer end,the pulley d, the strap surrounding the same and connected to said hub,the arm u, and the spring .2, the combination being and operating as setforth.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, t'his 1st day of August, A. D.1888.

JABEZ ILKINSON.

\Vitnesses:

HORDEN HOWARD, HENRY H. SHERMAN.

